Concrete-tamper.



E. e. CARR.

CONCRETE TAMPER.

APPLICATION mm DEC- 9. 1914.

Patented Oct. 31, 1916.

WITNESSES I/VVE/VTUR z [5 4 6775 6.637797? B) W A TTORNEYS UNITED STAES EDWARD G. CARE, OF OCEANSIDE, CALIFORNIA.

CONCRETE-TAMPER.

Application filed December 9, 1914. Serial No. 876,262.

and State of California, have invented an Improvement in Concrete-Tampers, of which the following is a specification.

My invention relates to improvements in tampers used 1n constructing concrete roads or beds and. has for its object to utilize the vibrations of a gasengine or similar motor and communicate such vibrations to the tamper, with a view to rendering the tamping operation on a road more uniform and certain.

lVith these and other objects in view, my invention consists in its broadest aspect in the utilization of the vibrations of a motor to tamp or float a concrete road'or bed.

My invention consists further in certain particular features of construction, arrangement and combination of parts as will be hereinafter fully described and pointed out in the claims, reference being had to the accompanying drawing in which- 7 Figure 1 is a planview of the invention in use. Fig. 2 is a side elevationof the same. Fig. 3 is a front elevation as in use. "Fig. 4 is a detail front elevation.

In carrying out my invention a carriage consisting of the axle A carrying the wheels B is used to run on the usual tracks O placed at the side of the road and defining the width thereof; on the axle of the carriage are pivoted the handles D at E, as shown in Figs. 1 and 2; the handles D it will be noticed are pivoted to the axle inside the wheels, thence extending forwardly and upwardly, as shown in Fig. 2; the tamping bar or frame F is a box-like structure consisting of the spaced apart side timbers F and the bottom board F the ends of the timbers F extending beyond the tracks 0 as at F.

As stated the handles D are pivoted to the axles A and E and extend forwardly; near each end of the tamping frame short vertical rods or pins G are secured passing upwardly through the handles D which are horizontal at this point and thence through the triangular bracket H bolted to the side timbers of the tamping frame, the brackets also forming guides for the rods and serving to confine a coil spring Z bearing downwardly on the flat portion D of the handles, so that the handles and tamping frame may have a flexible relative up and down motion.

At the center of the tam-ping frame is mounted a gasolene engine or like motor J having a fly wheel K, said wheel having the counterbalance weight K located on the same side of the crank of the crank shaft L of the engine. The throttle or "speeding mechamsm' of the engine is controlled'by a lever M having attached to it the rod, chain or wire M which extends to one side and is guided along one handle D and then passes into the handle which is preferably hollow or tubular to a point adjacent the hand grips D where it can be manipulated by an operator. The motor J can be a gaso-' lene engine, an electric motor or any suit able motor which will impart a great number of revolutions to the fly wheel so that vertical or other vibrations are set up.

To operate the device it is placed on the wooden tracks or ways C over the concrete bed and the engine started, a man being at each side and moving the device along, backward or forward by the handles D As the fly wheel attains a high number of revolutions the balance weight K being located on the same side as the crank shaft L it will be understood that at each revolution said weight being lifted at the sametime and in unison with the crank of the shaft, that as it goes down rapidly it will impart a down-' wardly pounding motion to the engine and as it is rigidly secured to the'tamping frame said frame will have imparted to itself a pounding motion or vibrations, these vibrations being made possible by itsfiexible sus-' pension from the handles D and the truck member by virtue of the springs Z interposed between the handles at D and the brackets H which are rigidly attached to the tamping frame, as shown. To save itfrom the jar of the tamper the engine or motor, may, if desired or found expedient, be located directly on the truck and suitably geared up with a revolving counter weight eccentrically and rigidly mounted on a shaft on the tamping frame so tions of the said counterweighted shaft through the eccentricity of the weight will cause an up and down motion or vibration to the tamping frame. It has been found by this method of tamping concrete by the vibration of an engine or counterweight shaft, that the work can be done expeditithat rapid revoluously, efiiciently and with great uniformity of finish, the tamper striking ofl the concrete to a certain level and finishing the top surface by working the water up to the top. Furthermore two weights revolving in opposite directions may be used to regulate the direction of the stroke.

I claim:

1. In a concrete tamper the, combination with a horizontal tamping bar or frame, means for suspending the frame across and slightly above a road or bed'and permitting freely a backward and forward movement of the frame and motor means carried by the bar or frame for imparting vibrations to said bar or frame.

2. In a concrete tamper the combination with a horizontal tamping bar or frame, means at each side of said bar or frame for suspending same across and slightly above a road or bed and permit a free back and forth motion of the frame thereover, a motor having rapid vibrations mounted on said bar or frame adapted to impart and translate its vibrations to the said bar or frame and transfer said vibrations to the road or bed.

3. In a concrete tamper, the combination with a horizontal tamping bar or frame, means for movably suspending the 7 same across a road or bed slightly above the same and a motor having rapid vibration mounted on said bar intermediate its ends.

4. In a concrete tamper the combination with a wheeled truck adapted to travel along a road or bed, hand bars mounted on said truck and extending forwardly therefrom, a tamping bar or frame suspended from said hand bars, a motor having a weighted fiy wheel and rigidly mounted on said bar or frame, whereby the vibrations of the motor are translated to the tamping bar or frame.

5. In a-concrete tamper, the combination with a horizontal tamping bar or frame, means for elastically suspending the same across a road or bed, and means carried by said bar or frame for imparting rapid vibra ing bar or frame flexibly suspended from said handles, a motor having a weighted fly wheel and rigidly mounted on said bar or frame and means mounted on one of said handles for controlling the operation of said motor.

8. In a concrete tamper, the combination with a wheeled truck adapted to travel along a road or bed, handles mounted on said truck and extending forwardly, a tamping bar or frame in advance of said truck, pins or rods adjacent each end of said tamping .bar or frame extending upwardly through the aforesaid handles, brackets secured to the tamping bar and projecting over the handles to receive the upper ends of the pins or rods, cushion springs mounted on said ins or rods between the handles and the brackets, an engine having a weighted balance wheel and rigidly mounted on the tamping bar or frame intermediate its ends, whereby vertical vibrations of the engine are imparted to the tampin bar or frame and it is given a rapid cushionedup and down movement.

EDWARD e. CARR.

Witnesses WM. Woonnurr, FRED HAYES. 

